"After leading the design of Apple's mobile processors, which have powered the iPhone and iPad over the last few years, chip architect Jim Keller is returning to AMD to head up its microprocessor core design team, the chipmaker announced today. Keller is an industry veteran who brought plenty of experience to Apple's mobile processors. He was previously vice president at P.A. Semiconductor, which Apple acquired in 2008 for $278 million, and he went on to serve as a director of Apple's platform architecture group."